Ara es mostren els items 21-40 de 53

    • Direct numerical simulation of rising bubble with path instability 

      Antepara Zambrano, Óscar; Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Present research is focused on combining High- Performance Computing (HPC) and Direct Numerical Simulation (DNS) of two-phase flows, to study the dy- namic behavior of rising bubble whit path instabilities with moderate/high ...
    • DNS of thermocapillary migration of a bi-dispersed suspension of droplets 

      Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Springer, 2023)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The multiple markers unstructured conservative level-set method for two-phase flow with variable surface tension is applied in the Direct Numerical Simulation of thermocapillary-migration of a bi-dispersed suspension of ...
    • Enhanced NAPL removal and mixing with engineered injection and extraction 

      Wang, Yufei; Fernández García, Daniel; Solé Marí, Guillem; Rodríguez Escales, Paula-Felicidad (2022-04)
      Article
      Accés obert
      Aquifer remediation with in-situ soil washing techniques and enhanced oil removal typically involves the injection of liquid solutions into the geological formation to displace and mobilize non-aqueous phase liquids (NAPLs). ...
    • Estudio numérico del transporte de burbujas de helio en metal líquido aplicado a tecnología de fusión nuclear 

      Mendes Louzada de Paula, Dayana (Universitat Politècnica de Catalunya, 2013-06)
      Treball Final de Grau
      Accés obert
      La posibilidad de que exista nucleación de helio dentro de las envolturas regeneradoras de metal líquido no es remota. En caso de existir, las consecuencias en la eficiencia térmica del reactor y en el control de tritio ...
    • Experimental analysis of bubble jets collision 

      Suñol Galofre, Francesc Xavier; González Cinca, Ricardo (Universite Libre de Bruxelles, 2008-09)
      Comunicació de congrés
      Accés obert
    • Experimental analysis of the bubble-slug transition in a minichannel in microgravity conditions 

      Arias Calderón, Santiago; González Cinca, Ricardo (ELGRA, 2009-09-01)
      Comunicació de congrés
      Accés obert
    • Experimental observations of two-phase flow in rough-walled fractures 

      Salvador Roda, Clara (Universitat Politècnica de Catalunya, 2014-06-06)
      Projecte/Treball Final de Carrera
      Accés obert
      This thesis presents an experimental investigation about the concurrent ow of water-air in a rough walled fracture. The focus of this investigation is on studying the effects of varying the orientation or gravity factor ...
    • Gravity-driven motion of a swarm of bubbles in a vertical pipe 

      Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Castro González, Jesús; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, Direct Numerical Simulations of gravity-driven motion of a swarm of bubbles in a vertical pipe are presented. These simulations were carried out in the contex of a multiple marker level-set methodology, which ...
    • High-order hybridizable discontinuous Galerkin formulation with fully implicit temporal schemes for the simulation of two-phase flow through porous media 

      Costa Solé, Albert; Ruiz Gironès, Eloi; Sarrate Ramos, Josep (John Wiley & Sons, 2021-07-30)
      Article
      Accés obert
      We present a memory-efficient high-order hybridizable discontinuous Galerkin (HDG) formulation coupled with high-order fully implicit Runge-Kutta schemes for immiscible and incompressible two-phase flow through porous ...
    • Hybrid multi-scale model for partially saturated media based on a pore network approach and lattice Boltzmann method 

      Puig Montellà, Eduard; Yuan, Chao; Chareyre, Bruno; Gens Solé, Antonio (Elsevier, 2020-10)
      Article
      Accés obert
      A model combining the efficiency of the pore-network (PN) models and the accuracy of the lattice Boltzmann Method (LBM) is proposed. We introduce a multi-scale approach based on a decomposition of the granular assembly ...
    • Low-frequency unsteadiness in the vortex formation region of a circular cylinder 

      Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Oliva Llena, Asensio (2013-08-23)
      Article
      Accés obert
      The presence of low-frequency fluctuations in the wake of bluff bodies have been observed in several investigations. Even though the flow past a circular cylinder at Re = 3900 (Re = U ref D/ν) has been the object of several ...
    • Modeling of gas migration through low-permeability clay rock using information on pressure and deformation from fast air injection tests 

      Senger, Rainer; Romero Morales, Enrique Edgar; Marschall, Paul (2018-07)
      Article
      Accés obert
      The characterization of gas migration through low-permeability clay formations has been a focus of R&D programs for radioactive waste disposal, which is also of great importance for shale gas exploration, cap-rock behavior ...
    • Near-interface flow modeling in large-eddy simulation of two-phase turbulence 

      Jofre Cruanyes, Lluís; Dodd, Michael S.; Grau Barceló, Joan; Torres Cámara, Ricardo (2020-11-11)
      Article
      Accés obert
      The smallest hydrodynamic length scales in two-phase turbulence are located at the interface between phases, or fluids, as a result of two-way coupling phenomena. Typically, these interface-generated scales are several ...
    • Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction 

      Arias Calderón, Santiago; Villardi de Montlaur, Adeline de (2020-05-26)
      Article
      Accés obert
      In this work, we study the transition from squeezing to dripping during the formation of bubbles in a capillary T-junction in conditions relevant to microgravity. The junction is formed by two perpendicular cylinders of ...
    • Numerical modelling of two-phase flow in fractured rock masses using zero-thickness interface elements 

      Barandiarán Villegas, Lucía Belén; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (International Centre for Numerical Methods in Engineering (CIMNE), 2021)
      Text en actes de congrés
      Accés obert
      In recent years, the authors and co-workers have developed a 3D finite element model for coupled thermo-hydro-mechanical (THM) problems in fractured rock masses. Zero-thickness interface elements are used for taking into ...
    • Numerical resolution in a PCM accumulator in cryogenic conditions 

      Morales Ruíz, Sergio; Rigola Serrano, Joaquim; Castro González, Jesús; Oliva Llena, Asensio (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      A numerical study of the thermal and fluid-dynamic behaviour of the two-phase flow inside ducts working under cryogenic conditions, coupled with the analysis of a phase change material PCM accumulator is presented. The ...
    • Numerical resolution of the heat accumulator in a Low Cost Cryogenic Propulsion (LCCP) system 

      Morales Ruíz, Sergio; Castro González, Jesús; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2011)
      Comunicació de congrés
      Accés obert
      In this paper, a numerical study of a heat accumulator in the LCCP system has been carried out. The thermal and fluid-dynamic behaviour of the two-phase flow inside ducts working under cryogenic conditions as a propellant ...
    • Numerical Simulation of High-Density Ratio Bubble Motion with interIsoFoam 

      Siriano, Simone; Balcázar Arciniega, Néstor; Tassone, Alessandro; Rigola Serrano, Joaquim; Caruso, Gianfranco (Multidisciplinary Digital Publishing Institute (MDPI), 2022-05-01)
      Article
      Accés obert
      The breeding blanket is one of the fundamental components of a nuclear fusion reactor and is responsible for the fuel production, generating tritium through neutronic capture reaction between lithium and neutrons. Lithium ...
    • Numerical simulation of incompressible two phase flows by conservative level set method 

      Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Castro González, Jesús (Budapest University of Technology and Economics, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A numerical formulation for the Conservative Level-Set Method of Olsson and Kreiss is implemented using the finite volume approach. Both convective term of the interface advection equation and compression term of the ...
    • Numerical simulation of non-adiabatic capillary tubes. Special emphasis on the near-saturation zone 

      Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 2015-04-15)
      Article
      Accés obert
      The aim of this article is to present a distributed numerical model that simulates the thermal and fluid-dynamic phenomena inside non-adiabatic capillary tubes. The resolution approach is based on a two-phase flow model ...